function clearpicksbutton(figno)
%
% NOTE: This SOFTWARE may be used by any individual or corporation for any purpose
% with the exception of re-selling or re-distributing the SOFTWARE.
% By using this software, you are agreeing to the terms detailed in this software's
% Matlab source file.

% BEGIN TERMS OF USE LICENSE
%
% This SOFTWARE is maintained by the CREWES Project at the Department
% of Geology and Geophysics of the University of Calgary, Calgary,
% Alberta, Canada.  The copyright and ownership is jointly held by
% its 'AUTHOR' (identified above) and the CREWES Project.  The CREWES
% project may be contacted via email at:  crewesinfo@crewes.org
%
% The term 'SOFTWARE' refers to the Matlab source code, translations to
% any other computer language, or object code
%
% Terms of use of this SOFTWARE
%
% 1) This SOFTWARE may be used by any individual or corporation for any purpose
%    with the exception of re-selling or re-distributing the SOFTWARE.
%
% 2) The AUTHOR and CREWES must be acknowledged in any resulting publications or
%    presentations
%
% 3) This SOFTWARE is provided "as is" with no warranty of any kind
%    either expressed or implied. CREWES makes no warranties or representation
%    as to its accuracy, completeness, or fitness for any purpose. CREWES
%    is under no obligation to provide support of any kind for this SOFTWARE.
%
% 4) CREWES periodically adds, changes, improves or updates this SOFTWARE without
%    notice. New versions will be made available at www.crewes.org .
%
% 5) Use this SOFTWARE at your own risk.
%
% END TERMS OF USE LICENSE

% Add a clear rays button to a plotimage fighure

%check for existing buttons
hkids=allchild(figno);
startpos=.02;
for k=1:length(hkids)
    tag=get(hkids(k),'tag');
    if(strcmp(tag,'raymigbutton')||strcmp(tag,'clearraysbutton')||...
            strcmp(tag,'clearpicksbutton')||strcmp(tag,'raymodbutton'))
        pos=get(hkids(k),'position');
        rightedge=pos(1)+pos(3);
        if(rightedge>startpos)
            startpos=rightedge+.01;
        end
    end
end
% wpixels=130;%desired width in pixels
% %determine window size
% pos=get(figno,'position');%should be in pixels
% %
% width=wpixels/pos(3);%width in normaliized units
width=.1;
uicontrol(figno,'style','pushbutton','string','clear picks','units','normalized',...
    'position',[startpos .95 width .05],'callback','clearpicks;clearlines','tag','clearpicksbutton');